Mr Koh's apparent abduction - an episode that takes place in just under a minute - took place in broad daylight and was witnessed by other drivers who later lodged police reports. Police are investigating the clip.

"The operation was very well planned. They knew who he was, where he was going, and probably had been tracking him," Mr Koh's son Jonathan tells the BBC.

"It was very professionally executed."

'Religious elements'

Abductions are not unheard of in Malaysia, but kidnappers usually make contact quickly with victims' families for a ransom.

Two months on, however, Mr Koh's family has not heard a single word from him or his alleged abductors.

They believe it is no ordinary kidnapping, and that "religious elements" took the pastor in an act of "vigilantism or terrorism".

Missing in Malaysia

Peter Chong: Social activist and former city councillor who disappeared last weekend near Kuala Lumpur. Police have since said he was seen crossing the border into Thailand.

Joshua and Ruth Hilmy: Pastor and his wife who were last seen near Kuala Lumpur in November.

Amri Che Mat: Muslim social activist allegedly snatched from his car in November, in the northern state of Perlis. His wife has denied allegations that he was spreading Shia Islam, which is banned by religious authorities.

There is no evidence these are in any way linked but in the absence of concrete information, many have come up with their own theories - including that the authorities may have had a hand in all this.

The "unprecedented mysterious" vanishings has led to "public perception and speculation... of forced disappearances", says the Malaysian Bar, using a term which usually refers to state-sponsored abductions.

"It is shocking and outrageous that a growing number of Malaysians could inexplicably disappear and not be found for days, weeks and months."

The police has not taken kindly to such rumours. Last month, the country's top police officer told citizens to "please shut up", and on Wednesday he told reporters there "was no connection".

Others have taken up the Kohs' theory and believe religious vigilante groups may be responsible.

Malaysian Muslims practise a moderate version of Sunni Islam, but in recent years the country has seen the rise of vocal Islamist groups.